Urgent help needed with front brake piston!!

[smisam]

I have a 06 tundra that i'm replacing the front brake pads on. I can compress three of the four pistons. i have tried everything to get the last on to compress. Any sugestions?

[robbob]

Originally Posted by smisam

I have a 06 tundra that i'm replacing the front brake pads on. I can compress three of the four pistons. i have tried everything to get the last on to compress. Any sugestions?

If the piston is siezed that bad you may want to either rebuild the caliper or by a replacement already rebuilt.

That said...... old brake pads still in... loosen bleeder fitting... on the side where you can compress both tighten down a C-clamp on it to hold it in place... then use a second C-clamp to drive in the other pistons... Only problem is if that one is damaged or siezed it will either not funtion, or leak, or be otherwise dangerous... and if you force it back in, chances are you will never be able to get it out again.. Last time I priced them, the rebuild kit was only about $18... and pretty easy to do as long as the piston bore is clean... if you have to hone it you can, but I'd buy a rebuilt unit in that case.....

Of course rebuilding is only an option if you are certain you can do the job correctly... badly rebuilding one is dangerous to you and whoever you hit after you are done...

Robert

[MEvang]

I don't recommend rebuilding the caliper if the piston is seized in the bore. You'll likely find that the piston is pitted and will need replaced. Honing the bore is not the proper way to remove rust. The housing must be sand blasted or it will return. Unless you have the means to do this your better off with a rebuilt unit
But first try rocking the piston with two screwdriver. It is possible to get the piston cocked slightly making it difficult to retracted. Rocking it can possible free it.
Mike

[smisam]

Thanks for the respons. I did fix the issue. I removed the calliper from the truck and was able to compress the pistons that way. I just took extra long bleeding the brakes when I was done. Drove the truck to day and had no problems.